[Mono-bugs] [Bug 76559][Wis] Changed - Software floating point emulation in the JIT

bugzilla-daemon at bugzilla.ximian.com bugzilla-daemon at bugzilla.ximian.com
Thu Oct 27 12:11:48 EDT 2005

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Changed by lupus at ximian.com.


--- shadow/76559	2005-10-25 15:40:41.000000000 -0400
+++ shadow/76559.tmp.6956	2005-10-27 12:11:48.000000000 -0400
@@ -2,13 +2,13 @@
 Product: Mono: Runtime
 Version: 1.1
 OS: All
 OS Details: 
 Status: NEW   
+Severity: Unknown
 Priority: Wishlist
 Component: JIT
 AssignedTo: lupus at ximian.com                            
 ReportedBy: alp at atoker.com               
 QAContact: mono-bugs at ximian.com
 TargetMilestone: ---
@@ -17,6 +17,16 @@
 Summary: Software floating point emulation in the JIT
 The Nokia 770 hardware doesn't have a VFP coprocessor, so Mono currently
 offloads floating point operations to the FPA. A nice optimisation would be
 to instead do this in the JIT, a method which can reportedly speed things
 up a fair bit.
+------- Additional Comments From lupus at ximian.com  2005-10-27 12:11 -------
+Note: the nokia 770 uses FPA (and doesn't have an FPA unit, so the
+comment above doesn't make much sense). Since the ABI used involves
+FPA, it doesn't make sense to implement soft-float support (except for
+a few corner cases, which involve no communication with the FPA ABI,
+or you' get a big slowdown with the conversion needed).
+Soft-float support is needed for some other ARM linux distributions
+(as used in the motorola Linux phones, for example), but it is
+irrelevant to the nokia 770.

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